Jane would never have gone to the party ____ that Mary would come to see her.   [ ]

A. has she known                  

B. had she known  

C. if she knows                 

D. if she has known

对于特别重要的工作场所，应采用独立电源，对事故照明供电，事故照明宜采用（）。

A.碘钨灯

B.高压汞灯

C.日光灯

D.白炽灯或卤钨灯